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16 Sep 11 – A cold front swept south from Canada resulting in widespread frost and record low temperatures for the time of year in the Upper Midwest and northern Great Lakes regions.

Duluth recorded a trace of snow on Wednesday, tying a daily record for early winter snowfall set in September 1984,” says this article on Irish Weather Online.

And with a temperature of just 19F (-7.2C) on Wednesday, International Falls, Minnesota, endured the coldest temperature on record for the time of year and the first time that a local reading in the teens has been recorded during the month of September.